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Length:230mm Material: stainless steel ; br> Suitable for drilling through holes, accurate positioning, rapid, smooth and straight drilling, smooth swarf, smooth hole wall, you can drill deep hole.br> Only suitable for wood work, do not drill metal materials.br> Suitable for hand drills, vertical electric drills and other drilling machines.br> br> Caution: To avoid drill bits become overheated and get burned up due to fast rotary friction, we suggest use some cutting fluid to keep the bits cold during usage. Package Included: 1pcs x 6mm(1/4") 1pcs x 8mm(5/16") 1pcs x 10mm(2/5") 1pcs x 12mm(1/2") 1pcs x 14mm(9/16") 1pcs x 16mm(5/8")